Question

The sun.the stars come up in the sky(simple sentence)​

Answer 1

The Sun as well as the stars come up in the sky.

If we write "The Sun AND the stars", it will become a Compound Sentence. So to avoid the usage of "And" we can use 'As well as' or 'Along with'....

Answer 2

Explanation:

The sun as well as the star comes in the sky.